Genes and alleles, genotype and phenotype, monohybrid crosses with Punnett squares, and codominance.
Genetics explains how characteristics pass from parents to offspring.
Key terms
- Gene: a section of DNA coding for a protein; allele: a version of a gene.
- Genotype: the alleles present; phenotype: the observable characteristic.
- Homozygous: two identical alleles (BB or bb); heterozygous: two different (Bb).
- Dominant alleles (capital) are expressed even when heterozygous; recessive (lower-case) only when homozygous.
Viewing only
This content is free to read on superexams.com and cannot be printed or downloaded.
Read the full note — free
Create a free account to read this note in full. Every free account gets 2 complete revision notes — no card needed.